Experience the emotional delivery of this ballad in Westlife's official lyric video: Westlife - If Your Heart's Not In It (Lyric Video) YouTube• May 19, 2013

Writing experts often advise authors to write "the book of your heart," warning that readers can sense when a writer's heart isn't in the work, making it harder to build a lasting career.

Rob Gronkowski recently applied this phrase to Travis Kelce amid retirement rumors, suggesting that in professional sports, you cannot continue if the passion (the "heart") is no longer there.

"But if your heart's not in it for real / Please don't try to fake what you don't feel" .